Telephone



Mach 4,. 11930. A L. J. LoEFr-'LER 1,749,593

l TELEPHONE Filed Jan. 28,A 1929 5mm/nto@ louis .Zoe'ler 335137125 @1jr/tomar Patented Mar. 4, 1930 PATENT OFFICE LOUIS J. LOEFFLER, F STALPIJETON, NEW YORK TELEPHONE Application filed January 28, 1929. Serial No. 335,466.

Thisinvention relates essentially to a telephone which is adapted for attachment in a recess in the wall of a passenger elevator, ship or building and the fundamental object Bof the invention is to provide the transmitting casing with a slot suitable for mounting the receiver so that it cannot be displaced by the vibration of the movable object.`

An object of the invention is to equip the transmitter with a spring switch which is operated to open or close the transmission circuit by the withdrawal and insertion of the receiver.

Another object `of the invention is to provide a telephone of shallow depth which can be readily xed in an opening in the wall of a movable object such as a passenger elevator so that none of the parts will protrude beyond the face of the wall and the receiver will not be jarred loose from its direct contact or engagement with the switch.

The invention resides more particularly in the novel combinations hereinafter described and claimed, reference being made to the accompanying drawing in which:

Fig. l represents a front elevation of a telephone showing the door opened.

Fig. 2 is a vertical longitudinal section taken along the line 2 2 of Fig. 1 showing the door closed.

Fig. 3 is a front elevation showing the switch closed.

In the drawing the numeral 5 designates a plate and 6 is a casing fixed to the rear of the plate. The casin carries a transmitter 7 as is well known. springV switch having contact members Sand 9 is secured at its upper ends to the casing. A swingingly mounted spring member l() provided with a stud 11 engages the lower end of the contact spring member 9 and is adapted to open and close the circuit. The switch has the usual leads and terminals connected to an electric circuit with a telephone at the other end;

A push button 12 to call the starter when a telephone is used in a passenger elevator is mounted on the plate, and a buzzer 14 secured to the back of the'plate with the usual connections to the starters telephone will call the attention of the elevator operator.

The plate is provided with a keyhole slot 15 for mounting a circular receiver 16 having a screw cap 17, the rim of which engages the lower portion of the swinging switch member, as indicated in Fig. 1. rIhe receiver is 55 inserted in the enlarged portion of the slot with the cap thereof facing the back of the casing and it is then pushed downward to enter the narrow lower portion of the slot. While pushing it downward the rim moves the swinging member l0 toward the contact 9 and the stud pushes the said contact away from the contact 8 thereby opening the circuit, as indicated in Fig. l. WVhen it is desired to close the circuit, the receiver is slid out of the slot and the spring member 9 forces the swinging member 10 toward the slot so as to bring the contacts together, as indicated in Fig.

The telephone is preferably fitted into an opening 18 in a. wall 19 of a ship, passenger elevator or other movable object. An angle iron surrounding the plate and secured to the wall forms a fixture to fasten the telephone, anda door 21 hinged to the side of the angle 75 iron closes the opening so as to conceal the telephone. As noted above, the telephone when in place in the opening occupies a small space and the constant vibration of the movable object cannot disengage the receiver from 8o the switch.

I claim:

l. In a telephone, the combination with a casing having a transmitter and a spring switch, of a slot located in the front of the casing for coaction with a receiver to open the switch by sliding the receiver into the slot or close the switch by removing the receiver.

2. In a telephone, the combination with a casing having a transmitter and a spring switch, of a keyhole slot located in the front of the casing for coaction with a receiver to open the switch by sliding the receiver into the slot or close the switch by removing the receiver.

3. In a telephone, the combination with a casing having a spring switch and a transmitting device, a plate lixed to the casing, of a keyhole slot located in the plate, and a receiver having a cap, the rim of which s adapted to engage the spring switch by the movement of the receiver When slid into the slot.

In testimony whereof my hand.

I have hereunto y set LOUIS J. LOEFFLER. 

